# Oasis vs Fastology

Oasis and Fastology are too close to call on the numbers: across 5 compared parameters — price, ads, in-app purchases and device support among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

## The numbers

| Metric | Oasis | Fastology |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.8 (5 ratings)](https://appshunter.io/ios/app/fastology-fasting-tracker/id6761324779/reviews)** |
| Number of ratings | — | **5** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | — | Fortnightly |
| Monetization | — | Free |
| Size | 43 MB | 40 MB |
| Requires iOS | **16.0** | 17.0 |
| Devices | iPhone, iPad | iPhone, Apple Watch |
| Age rating | 12+ | 4+ |
| Developer | [Andrei Pitunou](https://appshunter.io/developer/1825402878) | [SmallScale Works LLC](https://appshunter.io/developer/1888909483) |

## What reviewers say

### Oasis

[App page](https://appshunter.io/ios/app/oasis-hydration-tracker/id6758655816)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### Fastology

[App page](https://appshunter.io/ios/app/fastology-fasting-tracker/id6761324779)

This app provides structured tracking for intermittent fasting, going beyond simple timers. It helps users follow specific fasting schedules with clear phase progress, build consistency through streaks, and manage a flexible weekly plan. Focuses on discipline and reducing guesswork for a clearer fasting experience.

**Highlights:** Track various fast types (16:8, OMAD, extended), Live phase-by-phase progress tracking, Build streaks from completed fasts, Flexible weekly fasting schedule, Review fasting history, Ask fasting questions with reviewed answers, Siri and Shortcuts integration

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Oasis free?

Oasis is free to download, with no in-app purchases.

### Is Fastology free?

Fastology is free to download, with no in-app purchases.

### Do Oasis or Fastology have ads?

Neither Oasis nor Fastology shows ads.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*